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Table 4 Multiple regression analysis of demographic characteristics and numberof chronic diseases on the physical component summary(PCS) and physical component summary (MCS) from the SF–36 survey

From: Health related quality of life in pregeriatric patients with chronic diseases at urban, public supported clinics

Independent Variables Dependent Variables
  PCS Estimate (95% of Confidence Interval) P Value MCS Estimate (95% of Confidence Interval) P Value
Sex     
   Women Reference   Reference  
   Men -3.02 (-0.64 to -0.54) 0.01 -4.78 (7.80 to 1.76) 0.00
Age     
   <60 yr Reference   Reference  
   >60 yr 1.08 (-1.36 to 3.52) 0.38 -0.89 (-3.99 to 2.20) 0.57
Ethnicity     
   Caucasian Reference   Reference  
   African American 0.92 (-2.26 to 4.11) 0.57 -0.64 (-4.67 to 3.40) 0.76
   Hispanic 2.99 (-0.70 to 6.68) 0.11 -0.06 (-4.74 to -4.62) 0.98
Education     
   Above High School Reference   Reference  
   Less High School -1.08 (-2.65 to 4.80) 0.57 -2.84 (-1.88 to 7.57) 0.27
   High School -0.09 (-3.39 to 3.21) 0.96 -2.37 (-1.81 to 6.55) 0.27
Income (Household)     
   ≤$ 5,000 Reference   Reference  
   $ 5,000–$ 10,00 -0.20 (-3.21 to 3.60) 0.91 -5.11 (0.79 to 9.43) 0.02
   >$ 10,000 -2.84 (-0.59 to 6.26) 0.11 -5.07 (0.72 to 9.41) 0.02
Employment     
   Yes Reference:   Reference:  
   No -5.66 (-8.39 to -2.93) 0.00 -4.23 (-7.69 to -0.76) 0.01
No. of chronic diseases     
   1 Reference   Reference  
   2 -3.04 (-6.53 to 0.46) 0.09 -1.14 (-5.57 to 3.29) 0.61
   3 -8.53 (-12.18 to -4.87) 0.00 -2.77 (-7.40 to -1.86) 0.24
   4 -9.44 (-13.01 to -5.80) 0.00 -8.49 (-13.09 to -3.88) 0.00
R2* 0.23 0.00 0.13 0.00
  1. * Square of correlation coefficient (R).